Restaurants, however, are having a harder time participating in this salt attack. Burger King (BKC) promised a year ago to reduce the sodium content of its kids meals, but other quick-service restaurants have been slow to follow. Part of it is that salt helps preserve food that is increasingly sourced from all over the world, necessitating more time spent in transport. But another part of it, restaurant experts admit, is that people simply like the taste of salt.